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Full-adder is a digital circuit to perform arithmetic sum of two bits and a previous carry. It is represented in the diagram below. The circuit involves two half-adders & one OR gate. Alternately 2 XOR gates, 2 AND gates and 1 OR gate.
Click here for Verilog RTL example and test-bench for full-adder.
In_x
In_y
Carry_in
sum_out
Carry_out
0
0
0
0
0
0
0
1
1
0
0
1
0
1
0
0
1
1
0
1
1
0
0
1
0
1
0
1
0
1
1
1
0
0
1
1
1
1
1
1
4 - bit Binary Adder implementation, block diagram and discussion.
4 - bit Binary Adder - Subtractor implementation, block diagram and discussion.
Truth table for Full-Adder (FA)
Carry_out
Half-Adder , Adder-Subtractor . Verilog code - half-adder , full-adder
Block Diagram of Full Adder
